Jérôme Carnis

Ultrafast Optically Induced Perturbation of Oxygen Octahedral Rotations in Multiferroic BiFeO3 Thin Films

Ni Li, Hyeon Jun Lee, Deepankar Sri Gyan, Youngjun Ahn et autres

The functional properties of complex oxides, including magnetism and ferroelectricity, are closely linked to subtle structural distortions. Ultrafast optical excitations provide the means to manipulate structural features and ultimately to affect the functional properties of complex oxides with picosecond-scale precision. We report …

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Imaging via Correlation of X-Ray Fluorescence Photons

F. Trost, Kartik Ayyer, Mauro Prasciolu, Holger Fleckenstein et autres

We demonstrate that x-ray fluorescence emission, which cannot maintain a stationary interference pattern, can be used to obtain images of structures by recording photon-photon correlations in the manner of the stellar intensity interferometry of Hanbury Brown and Twiss. This is achieved utilizing …

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Anomalous Glide Plane in Platinum Nano- and Microcrystals

Marie‐Ingrid Richard, S. Labat, Maxime Dupraz, Jérôme Carnis et autres

At the nanoscale, the properties of materials depend critically on the presence of crystal defects. However, imaging and characterizing the structure of defects in three dimensions inside a crystal remain a challenge. Here, by using Bragg coherent diffraction imaging, we observe an …

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Automatic bad-pixel mask maker for X-ray pixel detectors with application to serial crystallography

Alireza Sadri, Marjan Hadian-Jazi, Oleksandr M. Yefanov, M. Galchenkova et autres

X-ray crystallography has witnessed a massive development over the past decade, driven by large increases in the intensity and brightness of X-ray sources and enabled by employing high-frame-rate X-ray detectors. The analysis of large data sets is done via automatic algorithms that …

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Statistical analysis of hard X-ray radiation at the PAL-XFEL facility performed by Hanbury Brown and Twiss interferometry

Young Yong Kim, Ruslan Khubbutdinov, Jérôme Carnis, Sangsoo Kim et autres

A Hanbury Brown and Twiss interferometry experiment based on second-order correlations was performed at the PAL-XFEL facility. The statistical properties of the X-ray radiation were studied within this experiment. Measurements were performed at the NCI beamline at 10 keV photon energy under …

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Convergent beam X-ray diffraction using multilayer Laue lenses – an exploration following in John's footsteps

Chufeng Li, N. G. Ivanov, Mauro Prasciolu, Holger Fleckenstein et autres

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Gwaihir : Jupyter Notebook graphical user interface for Bragg coherent diffraction imaging

David Simonne, Jérôme Carnis, Clément Atlan, Corentin Chatelier et autres

Bragg coherent X-ray diffraction is a nondestructive method for probing material structure in three dimensions at the nanoscale, with unprecedented resolution in displacement and strain fields. This work presents Gwaihir , a user-friendly and open-source tool to process and analyze Bragg coherent …

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Precise wavefront characterization of x-ray optical elements using a laboratory source

J. Lukas Dresselhaus, Holger Fleckenstein, M. Domaracký, Mauro Prasciolu et autres

Improvements in x-ray optics critically depend on the measurement of their optical performance. The knowledge of wavefront aberrations, for example, can be used to improve the fabrication of optical elements or to design phase correctors to compensate for these errors. At present, …

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Variable-wavelength quick scanning nano-focused X-ray microscopy for in situ strain and tilt mapping

Marie-ingrid Richard, Thomas W. Cornelius, Florian Lauraux, Jean‐Baptiste Molin et autres

Compression of micro-pillars is followed in situ by a quick nano-focused X-ray scanning microscopy technique combined with three-dimensional reciprocal space mapping. Compared to other attempts using 2 X-ray nanobeams, it avoids any motion or vibration that would lead to a destruction of …

Robust ptychographic X-ray speckle tracking with multilayer Laue lenses

N. G. Ivanov, J. Lukas Dresselhaus, Jérôme Carnis, M. Domaracký et autres

In recent years, X-ray speckle tracking techniques have emerged as viable tools for wavefront metrology and sample imaging applications, and have been actively developed for use at synchrotron light sources. Speckle techniques can recover an image free of aberrations and can be …

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Optically Induced Picosecond Lattice Compression in the Dielectric Component of a Strongly Coupled Ferroelectric/Dielectric Superlattice (Adv. Electron. Mater. 6/2022)

Deepankar Sri Gyan, Hyeon Jun Lee, Youngjun Ahn, River B. Carson et autres

Ultrafast Optical Excitation The structure of an epitaxial BaTiO3/CaTiO3 ferroelectric/dielectric superlattice responds to aboveband gap ultrafast optical excitation with a compression of the dielectric CaTiO3 layer is presented in article number 2101051 by Paul G. Evans and co-workers. This unusual response is …

Imaging the facet surface strain state of supported multi-faceted Pt nanoparticles during reaction

Maxime Dupraz, Ni Li, Jérôme Carnis, Longfei Wu et autres

Abstract Nanostructures with specific crystallographic planes display distinctive physico-chemical properties because of their unique atomic arrangements, resulting in widespread applications in catalysis, energy conversion or sensing. Understanding strain dynamics and their relationship with crystallographic facets have been largely unexplored. Here, we reveal …

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